I am guessing it wasn't a "swinger's cruise" at all - but just one "swinger" (I'm a wild & crazy guy from Czechoslovakia) who was looking for a partner.
I once had a post like and deleted and wrote to the guy, just to be polite, and advised him that prefer not to have such posts.
He replied to me that swingers comprise X-percent of the US population, while gay people only comprise a smaller percentage - but gays are "protected" with rights, etc, while swingers are vilified.
I don't know if what he said is true, personally, I know a lot more gay people than swingers, but if you "swing" and want to come out of the closet, more power to you.
"Me Tarzan, you Jane. Me swing from vine and pay for cruise, you peel banana."